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Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / drivers / net / hyperv / netvsc_drv.c
1 /*
2 * Copyright (c) 2009, Microsoft Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, see <http://www.gnu.org/licenses/>.
15 *
16 * Authors:
17 * Haiyang Zhang <haiyangz@microsoft.com>
18 * Hank Janssen <hjanssen@microsoft.com>
19 */
20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
22 #include <linux/init.h>
23 #include <linux/atomic.h>
24 #include <linux/module.h>
25 #include <linux/highmem.h>
26 #include <linux/device.h>
27 #include <linux/io.h>
28 #include <linux/delay.h>
29 #include <linux/netdevice.h>
30 #include <linux/inetdevice.h>
31 #include <linux/etherdevice.h>
32 #include <linux/skbuff.h>
33 #include <linux/if_vlan.h>
34 #include <linux/in.h>
35 #include <linux/slab.h>
36 #include <net/arp.h>
37 #include <net/route.h>
38 #include <net/sock.h>
39 #include <net/pkt_sched.h>
40
41 #include "hyperv_net.h"
42
43
44 #define RING_SIZE_MIN 64
45 #define LINKCHANGE_INT (2 * HZ)
46 #define NETVSC_HW_FEATURES (NETIF_F_RXCSUM | \
47 NETIF_F_SG | \
48 NETIF_F_TSO | \
49 NETIF_F_TSO6 | \
50 NETIF_F_HW_CSUM)
51 static int ring_size = 128;
52 module_param(ring_size, int, S_IRUGO);
53 MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
54
55 static int max_num_vrss_chns = 8;
56
57 static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
58 NETIF_MSG_LINK | NETIF_MSG_IFUP |
59 NETIF_MSG_IFDOWN | NETIF_MSG_RX_ERR |
60 NETIF_MSG_TX_ERR;
61
62 static int debug = -1;
63 module_param(debug, int, S_IRUGO);
64 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
65
66 static void do_set_multicast(struct work_struct *w)
67 {
68 struct net_device_context *ndevctx =
69 container_of(w, struct net_device_context, work);
70 struct hv_device *device_obj = ndevctx->device_ctx;
71 struct net_device *ndev = hv_get_drvdata(device_obj);
72 struct netvsc_device *nvdev = ndevctx->nvdev;
73 struct rndis_device *rdev;
74
75 if (!nvdev)
76 return;
77
78 rdev = nvdev->extension;
79 if (rdev == NULL)
80 return;
81
82 if (ndev->flags & IFF_PROMISC)
83 rndis_filter_set_packet_filter(rdev,
84 NDIS_PACKET_TYPE_PROMISCUOUS);
85 else
86 rndis_filter_set_packet_filter(rdev,
87 NDIS_PACKET_TYPE_BROADCAST |
88 NDIS_PACKET_TYPE_ALL_MULTICAST |
89 NDIS_PACKET_TYPE_DIRECTED);
90 }
91
92 static void netvsc_set_multicast_list(struct net_device *net)
93 {
94 struct net_device_context *net_device_ctx = netdev_priv(net);
95
96 schedule_work(&net_device_ctx->work);
97 }
98
99 static int netvsc_open(struct net_device *net)
100 {
101 struct net_device_context *net_device_ctx = netdev_priv(net);
102 struct hv_device *device_obj = net_device_ctx->device_ctx;
103 struct netvsc_device *nvdev = net_device_ctx->nvdev;
104 struct rndis_device *rdev;
105 int ret = 0;
106
107 netif_carrier_off(net);
108
109 /* Open up the device */
110 ret = rndis_filter_open(device_obj);
111 if (ret != 0) {
112 netdev_err(net, "unable to open device (ret %d).\n", ret);
113 return ret;
114 }
115
116 netif_tx_wake_all_queues(net);
117
118 rdev = nvdev->extension;
119 if (!rdev->link_state)
120 netif_carrier_on(net);
121
122 return ret;
123 }
124
125 static int netvsc_close(struct net_device *net)
126 {
127 struct net_device_context *net_device_ctx = netdev_priv(net);
128 struct hv_device *device_obj = net_device_ctx->device_ctx;
129 struct netvsc_device *nvdev = net_device_ctx->nvdev;
130 int ret;
131 u32 aread, awrite, i, msec = 10, retry = 0, retry_max = 20;
132 struct vmbus_channel *chn;
133
134 netif_tx_disable(net);
135
136 /* Make sure netvsc_set_multicast_list doesn't re-enable filter! */
137 cancel_work_sync(&net_device_ctx->work);
138 ret = rndis_filter_close(device_obj);
139 if (ret != 0) {
140 netdev_err(net, "unable to close device (ret %d).\n", ret);
141 return ret;
142 }
143
144 /* Ensure pending bytes in ring are read */
145 while (true) {
146 aread = 0;
147 for (i = 0; i < nvdev->num_chn; i++) {
148 chn = nvdev->chn_table[i];
149 if (!chn)
150 continue;
151
152 hv_get_ringbuffer_availbytes(&chn->inbound, &aread,
153 &awrite);
154
155 if (aread)
156 break;
157
158 hv_get_ringbuffer_availbytes(&chn->outbound, &aread,
159 &awrite);
160
161 if (aread)
162 break;
163 }
164
165 retry++;
166 if (retry > retry_max || aread == 0)
167 break;
168
169 msleep(msec);
170
171 if (msec < 1000)
172 msec *= 2;
173 }
174
175 if (aread) {
176 netdev_err(net, "Ring buffer not empty after closing rndis\n");
177 ret = -ETIMEDOUT;
178 }
179
180 return ret;
181 }
182
183 static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size,
184 int pkt_type)
185 {
186 struct rndis_packet *rndis_pkt;
187 struct rndis_per_packet_info *ppi;
188
189 rndis_pkt = &msg->msg.pkt;
190 rndis_pkt->data_offset += ppi_size;
191
192 ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt +
193 rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len);
194
195 ppi->size = ppi_size;
196 ppi->type = pkt_type;
197 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
198
199 rndis_pkt->per_pkt_info_len += ppi_size;
200
201 return ppi;
202 }
203
204 static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
205 void *accel_priv, select_queue_fallback_t fallback)
206 {
207 struct net_device_context *net_device_ctx = netdev_priv(ndev);
208 struct netvsc_device *nvsc_dev = net_device_ctx->nvdev;
209 u32 hash;
210 u16 q_idx = 0;
211
212 if (nvsc_dev == NULL || ndev->real_num_tx_queues <= 1)
213 return 0;
214
215 hash = skb_get_hash(skb);
216 q_idx = nvsc_dev->send_table[hash % VRSS_SEND_TAB_SIZE] %
217 ndev->real_num_tx_queues;
218
219 if (!nvsc_dev->chn_table[q_idx])
220 q_idx = 0;
221
222 return q_idx;
223 }
224
225 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
226 struct hv_page_buffer *pb)
227 {
228 int j = 0;
229
230 /* Deal with compund pages by ignoring unused part
231 * of the page.
232 */
233 page += (offset >> PAGE_SHIFT);
234 offset &= ~PAGE_MASK;
235
236 while (len > 0) {
237 unsigned long bytes;
238
239 bytes = PAGE_SIZE - offset;
240 if (bytes > len)
241 bytes = len;
242 pb[j].pfn = page_to_pfn(page);
243 pb[j].offset = offset;
244 pb[j].len = bytes;
245
246 offset += bytes;
247 len -= bytes;
248
249 if (offset == PAGE_SIZE && len) {
250 page++;
251 offset = 0;
252 j++;
253 }
254 }
255
256 return j + 1;
257 }
258
259 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
260 struct hv_netvsc_packet *packet,
261 struct hv_page_buffer **page_buf)
262 {
263 struct hv_page_buffer *pb = *page_buf;
264 u32 slots_used = 0;
265 char *data = skb->data;
266 int frags = skb_shinfo(skb)->nr_frags;
267 int i;
268
269 /* The packet is laid out thus:
270 * 1. hdr: RNDIS header and PPI
271 * 2. skb linear data
272 * 3. skb fragment data
273 */
274 if (hdr != NULL)
275 slots_used += fill_pg_buf(virt_to_page(hdr),
276 offset_in_page(hdr),
277 len, &pb[slots_used]);
278
279 packet->rmsg_size = len;
280 packet->rmsg_pgcnt = slots_used;
281
282 slots_used += fill_pg_buf(virt_to_page(data),
283 offset_in_page(data),
284 skb_headlen(skb), &pb[slots_used]);
285
286 for (i = 0; i < frags; i++) {
287 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
288
289 slots_used += fill_pg_buf(skb_frag_page(frag),
290 frag->page_offset,
291 skb_frag_size(frag), &pb[slots_used]);
292 }
293 return slots_used;
294 }
295
296 static int count_skb_frag_slots(struct sk_buff *skb)
297 {
298 int i, frags = skb_shinfo(skb)->nr_frags;
299 int pages = 0;
300
301 for (i = 0; i < frags; i++) {
302 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
303 unsigned long size = skb_frag_size(frag);
304 unsigned long offset = frag->page_offset;
305
306 /* Skip unused frames from start of page */
307 offset &= ~PAGE_MASK;
308 pages += PFN_UP(offset + size);
309 }
310 return pages;
311 }
312
313 static int netvsc_get_slots(struct sk_buff *skb)
314 {
315 char *data = skb->data;
316 unsigned int offset = offset_in_page(data);
317 unsigned int len = skb_headlen(skb);
318 int slots;
319 int frag_slots;
320
321 slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
322 frag_slots = count_skb_frag_slots(skb);
323 return slots + frag_slots;
324 }
325
326 static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off)
327 {
328 u32 ret_val = TRANSPORT_INFO_NOT_IP;
329
330 if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) &&
331 (eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) {
332 goto not_ip;
333 }
334
335 *trans_off = skb_transport_offset(skb);
336
337 if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) {
338 struct iphdr *iphdr = ip_hdr(skb);
339
340 if (iphdr->protocol == IPPROTO_TCP)
341 ret_val = TRANSPORT_INFO_IPV4_TCP;
342 else if (iphdr->protocol == IPPROTO_UDP)
343 ret_val = TRANSPORT_INFO_IPV4_UDP;
344 } else {
345 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
346 ret_val = TRANSPORT_INFO_IPV6_TCP;
347 else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
348 ret_val = TRANSPORT_INFO_IPV6_UDP;
349 }
350
351 not_ip:
352 return ret_val;
353 }
354
355 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
356 {
357 struct net_device_context *net_device_ctx = netdev_priv(net);
358 struct hv_netvsc_packet *packet = NULL;
359 int ret;
360 unsigned int num_data_pgs;
361 struct rndis_message *rndis_msg;
362 struct rndis_packet *rndis_pkt;
363 u32 rndis_msg_size;
364 bool isvlan;
365 bool linear = false;
366 struct rndis_per_packet_info *ppi;
367 struct ndis_tcp_ip_checksum_info *csum_info;
368 struct ndis_tcp_lso_info *lso_info;
369 int hdr_offset;
370 u32 net_trans_info;
371 u32 hash;
372 u32 skb_length;
373 struct hv_page_buffer page_buf[MAX_PAGE_BUFFER_COUNT];
374 struct hv_page_buffer *pb = page_buf;
375 struct netvsc_stats *tx_stats = this_cpu_ptr(net_device_ctx->tx_stats);
376
377 /* We will atmost need two pages to describe the rndis
378 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
379 * of pages in a single packet. If skb is scattered around
380 * more pages we try linearizing it.
381 */
382
383 check_size:
384 skb_length = skb->len;
385 num_data_pgs = netvsc_get_slots(skb) + 2;
386 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT && linear) {
387 net_alert_ratelimited("packet too big: %u pages (%u bytes)\n",
388 num_data_pgs, skb->len);
389 ret = -EFAULT;
390 goto drop;
391 } else if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
392 if (skb_linearize(skb)) {
393 net_alert_ratelimited("failed to linearize skb\n");
394 ret = -ENOMEM;
395 goto drop;
396 }
397 linear = true;
398 goto check_size;
399 }
400
401 /*
402 * Place the rndis header in the skb head room and
403 * the skb->cb will be used for hv_netvsc_packet
404 * structure.
405 */
406 ret = skb_cow_head(skb, RNDIS_AND_PPI_SIZE);
407 if (ret) {
408 netdev_err(net, "unable to alloc hv_netvsc_packet\n");
409 ret = -ENOMEM;
410 goto drop;
411 }
412 /* Use the skb control buffer for building up the packet */
413 BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) >
414 FIELD_SIZEOF(struct sk_buff, cb));
415 packet = (struct hv_netvsc_packet *)skb->cb;
416
417
418 packet->q_idx = skb_get_queue_mapping(skb);
419
420 packet->total_data_buflen = skb->len;
421
422 rndis_msg = (struct rndis_message *)skb->head;
423
424 memset(rndis_msg, 0, RNDIS_AND_PPI_SIZE);
425
426 isvlan = skb->vlan_tci & VLAN_TAG_PRESENT;
427
428 /* Add the rndis header */
429 rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
430 rndis_msg->msg_len = packet->total_data_buflen;
431 rndis_pkt = &rndis_msg->msg.pkt;
432 rndis_pkt->data_offset = sizeof(struct rndis_packet);
433 rndis_pkt->data_len = packet->total_data_buflen;
434 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
435
436 rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
437
438 hash = skb_get_hash_raw(skb);
439 if (hash != 0 && net->real_num_tx_queues > 1) {
440 rndis_msg_size += NDIS_HASH_PPI_SIZE;
441 ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
442 NBL_HASH_VALUE);
443 *(u32 *)((void *)ppi + ppi->ppi_offset) = hash;
444 }
445
446 if (isvlan) {
447 struct ndis_pkt_8021q_info *vlan;
448
449 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
450 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
451 IEEE_8021Q_INFO);
452 vlan = (struct ndis_pkt_8021q_info *)((void *)ppi +
453 ppi->ppi_offset);
454 vlan->vlanid = skb->vlan_tci & VLAN_VID_MASK;
455 vlan->pri = (skb->vlan_tci & VLAN_PRIO_MASK) >>
456 VLAN_PRIO_SHIFT;
457 }
458
459 net_trans_info = get_net_transport_info(skb, &hdr_offset);
460 if (net_trans_info == TRANSPORT_INFO_NOT_IP)
461 goto do_send;
462
463 /*
464 * Setup the sendside checksum offload only if this is not a
465 * GSO packet.
466 */
467 if (skb_is_gso(skb))
468 goto do_lso;
469
470 if ((skb->ip_summed == CHECKSUM_NONE) ||
471 (skb->ip_summed == CHECKSUM_UNNECESSARY))
472 goto do_send;
473
474 rndis_msg_size += NDIS_CSUM_PPI_SIZE;
475 ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
476 TCPIP_CHKSUM_PKTINFO);
477
478 csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
479 ppi->ppi_offset);
480
481 if (net_trans_info & (INFO_IPV4 << 16))
482 csum_info->transmit.is_ipv4 = 1;
483 else
484 csum_info->transmit.is_ipv6 = 1;
485
486 if (net_trans_info & INFO_TCP) {
487 csum_info->transmit.tcp_checksum = 1;
488 csum_info->transmit.tcp_header_offset = hdr_offset;
489 } else if (net_trans_info & INFO_UDP) {
490 /* UDP checksum offload is not supported on ws2008r2.
491 * Furthermore, on ws2012 and ws2012r2, there are some
492 * issues with udp checksum offload from Linux guests.
493 * (these are host issues).
494 * For now compute the checksum here.
495 */
496 struct udphdr *uh;
497 u16 udp_len;
498
499 ret = skb_cow_head(skb, 0);
500 if (ret)
501 goto drop;
502
503 uh = udp_hdr(skb);
504 udp_len = ntohs(uh->len);
505 uh->check = 0;
506 uh->check = csum_tcpudp_magic(ip_hdr(skb)->saddr,
507 ip_hdr(skb)->daddr,
508 udp_len, IPPROTO_UDP,
509 csum_partial(uh, udp_len, 0));
510 if (uh->check == 0)
511 uh->check = CSUM_MANGLED_0;
512
513 csum_info->transmit.udp_checksum = 0;
514 }
515 goto do_send;
516
517 do_lso:
518 rndis_msg_size += NDIS_LSO_PPI_SIZE;
519 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
520 TCP_LARGESEND_PKTINFO);
521
522 lso_info = (struct ndis_tcp_lso_info *)((void *)ppi +
523 ppi->ppi_offset);
524
525 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
526 if (net_trans_info & (INFO_IPV4 << 16)) {
527 lso_info->lso_v2_transmit.ip_version =
528 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
529 ip_hdr(skb)->tot_len = 0;
530 ip_hdr(skb)->check = 0;
531 tcp_hdr(skb)->check =
532 ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
533 ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
534 } else {
535 lso_info->lso_v2_transmit.ip_version =
536 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
537 ipv6_hdr(skb)->payload_len = 0;
538 tcp_hdr(skb)->check =
539 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
540 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
541 }
542 lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset;
543 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
544
545 do_send:
546 /* Start filling in the page buffers with the rndis hdr */
547 rndis_msg->msg_len += rndis_msg_size;
548 packet->total_data_buflen = rndis_msg->msg_len;
549 packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
550 skb, packet, &pb);
551
552 /* timestamp packet in software */
553 skb_tx_timestamp(skb);
554 ret = netvsc_send(net_device_ctx->device_ctx, packet,
555 rndis_msg, &pb, skb);
556
557 drop:
558 if (ret == 0) {
559 u64_stats_update_begin(&tx_stats->syncp);
560 tx_stats->packets++;
561 tx_stats->bytes += skb_length;
562 u64_stats_update_end(&tx_stats->syncp);
563 } else {
564 if (ret != -EAGAIN) {
565 dev_kfree_skb_any(skb);
566 net->stats.tx_dropped++;
567 }
568 }
569
570 return (ret == -EAGAIN) ? NETDEV_TX_BUSY : NETDEV_TX_OK;
571 }
572
573 /*
574 * netvsc_linkstatus_callback - Link up/down notification
575 */
576 void netvsc_linkstatus_callback(struct hv_device *device_obj,
577 struct rndis_message *resp)
578 {
579 struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
580 struct net_device *net;
581 struct net_device_context *ndev_ctx;
582 struct netvsc_reconfig *event;
583 unsigned long flags;
584
585 /* Handle link change statuses only */
586 if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE &&
587 indicate->status != RNDIS_STATUS_MEDIA_CONNECT &&
588 indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT)
589 return;
590
591 net = hv_get_drvdata(device_obj);
592
593 if (!net || net->reg_state != NETREG_REGISTERED)
594 return;
595
596 ndev_ctx = netdev_priv(net);
597
598 event = kzalloc(sizeof(*event), GFP_ATOMIC);
599 if (!event)
600 return;
601 event->event = indicate->status;
602
603 spin_lock_irqsave(&ndev_ctx->lock, flags);
604 list_add_tail(&event->list, &ndev_ctx->reconfig_events);
605 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
606
607 schedule_delayed_work(&ndev_ctx->dwork, 0);
608 }
609
610
611 static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
612 struct hv_netvsc_packet *packet,
613 struct ndis_tcp_ip_checksum_info *csum_info,
614 void *data, u16 vlan_tci)
615 {
616 struct sk_buff *skb;
617
618 skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
619 if (!skb)
620 return skb;
621
622 /*
623 * Copy to skb. This copy is needed here since the memory pointed by
624 * hv_netvsc_packet cannot be deallocated
625 */
626 memcpy(skb_put(skb, packet->total_data_buflen), data,
627 packet->total_data_buflen);
628
629 skb->protocol = eth_type_trans(skb, net);
630 if (csum_info) {
631 /* We only look at the IP checksum here.
632 * Should we be dropping the packet if checksum
633 * failed? How do we deal with other checksums - TCP/UDP?
634 */
635 if (csum_info->receive.ip_checksum_succeeded)
636 skb->ip_summed = CHECKSUM_UNNECESSARY;
637 else
638 skb->ip_summed = CHECKSUM_NONE;
639 }
640
641 if (vlan_tci & VLAN_TAG_PRESENT)
642 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
643 vlan_tci);
644
645 return skb;
646 }
647
648 /*
649 * netvsc_recv_callback - Callback when we receive a packet from the
650 * "wire" on the specified device.
651 */
652 int netvsc_recv_callback(struct hv_device *device_obj,
653 struct hv_netvsc_packet *packet,
654 void **data,
655 struct ndis_tcp_ip_checksum_info *csum_info,
656 struct vmbus_channel *channel,
657 u16 vlan_tci)
658 {
659 struct net_device *net = hv_get_drvdata(device_obj);
660 struct net_device_context *net_device_ctx = netdev_priv(net);
661 struct sk_buff *skb;
662 struct sk_buff *vf_skb;
663 struct netvsc_stats *rx_stats;
664 struct netvsc_device *netvsc_dev = net_device_ctx->nvdev;
665 u32 bytes_recvd = packet->total_data_buflen;
666 int ret = 0;
667
668 if (!net || net->reg_state != NETREG_REGISTERED)
669 return NVSP_STAT_FAIL;
670
671 if (READ_ONCE(netvsc_dev->vf_inject)) {
672 atomic_inc(&netvsc_dev->vf_use_cnt);
673 if (!READ_ONCE(netvsc_dev->vf_inject)) {
674 /*
675 * We raced; just move on.
676 */
677 atomic_dec(&netvsc_dev->vf_use_cnt);
678 goto vf_injection_done;
679 }
680
681 /*
682 * Inject this packet into the VF inerface.
683 * On Hyper-V, multicast and brodcast packets
684 * are only delivered on the synthetic interface
685 * (after subjecting these to policy filters on
686 * the host). Deliver these via the VF interface
687 * in the guest.
688 */
689 vf_skb = netvsc_alloc_recv_skb(netvsc_dev->vf_netdev, packet,
690 csum_info, *data, vlan_tci);
691 if (vf_skb != NULL) {
692 ++netvsc_dev->vf_netdev->stats.rx_packets;
693 netvsc_dev->vf_netdev->stats.rx_bytes += bytes_recvd;
694 netif_receive_skb(vf_skb);
695 } else {
696 ++net->stats.rx_dropped;
697 ret = NVSP_STAT_FAIL;
698 }
699 atomic_dec(&netvsc_dev->vf_use_cnt);
700 return ret;
701 }
702
703 vf_injection_done:
704 net_device_ctx = netdev_priv(net);
705 rx_stats = this_cpu_ptr(net_device_ctx->rx_stats);
706
707 /* Allocate a skb - TODO direct I/O to pages? */
708 skb = netvsc_alloc_recv_skb(net, packet, csum_info, *data, vlan_tci);
709 if (unlikely(!skb)) {
710 ++net->stats.rx_dropped;
711 return NVSP_STAT_FAIL;
712 }
713 skb_record_rx_queue(skb, channel->
714 offermsg.offer.sub_channel_index);
715
716 u64_stats_update_begin(&rx_stats->syncp);
717 rx_stats->packets++;
718 rx_stats->bytes += packet->total_data_buflen;
719 u64_stats_update_end(&rx_stats->syncp);
720
721 /*
722 * Pass the skb back up. Network stack will deallocate the skb when it
723 * is done.
724 * TODO - use NAPI?
725 */
726 netif_rx(skb);
727
728 return 0;
729 }
730
731 static void netvsc_get_drvinfo(struct net_device *net,
732 struct ethtool_drvinfo *info)
733 {
734 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
735 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
736 }
737
738 static void netvsc_get_channels(struct net_device *net,
739 struct ethtool_channels *channel)
740 {
741 struct net_device_context *net_device_ctx = netdev_priv(net);
742 struct netvsc_device *nvdev = net_device_ctx->nvdev;
743
744 if (nvdev) {
745 channel->max_combined = nvdev->max_chn;
746 channel->combined_count = nvdev->num_chn;
747 }
748 }
749
750 static int netvsc_set_channels(struct net_device *net,
751 struct ethtool_channels *channels)
752 {
753 struct net_device_context *net_device_ctx = netdev_priv(net);
754 struct hv_device *dev = net_device_ctx->device_ctx;
755 struct netvsc_device *nvdev = net_device_ctx->nvdev;
756 struct netvsc_device_info device_info;
757 u32 num_chn;
758 u32 max_chn;
759 int ret = 0;
760 bool recovering = false;
761
762 if (net_device_ctx->start_remove || !nvdev || nvdev->destroy)
763 return -ENODEV;
764
765 num_chn = nvdev->num_chn;
766 max_chn = min_t(u32, nvdev->max_chn, num_online_cpus());
767
768 if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5) {
769 pr_info("vRSS unsupported before NVSP Version 5\n");
770 return -EINVAL;
771 }
772
773 /* We do not support rx, tx, or other */
774 if (!channels ||
775 channels->rx_count ||
776 channels->tx_count ||
777 channels->other_count ||
778 (channels->combined_count < 1))
779 return -EINVAL;
780
781 if (channels->combined_count > max_chn) {
782 pr_info("combined channels too high, using %d\n", max_chn);
783 channels->combined_count = max_chn;
784 }
785
786 ret = netvsc_close(net);
787 if (ret)
788 goto out;
789
790 do_set:
791 net_device_ctx->start_remove = true;
792 rndis_filter_device_remove(dev);
793
794 nvdev->num_chn = channels->combined_count;
795
796 memset(&device_info, 0, sizeof(device_info));
797 device_info.num_chn = nvdev->num_chn; /* passed to RNDIS */
798 device_info.ring_size = ring_size;
799 device_info.max_num_vrss_chns = max_num_vrss_chns;
800
801 ret = rndis_filter_device_add(dev, &device_info);
802 if (ret) {
803 if (recovering) {
804 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
805 return ret;
806 }
807 goto recover;
808 }
809
810 nvdev = net_device_ctx->nvdev;
811
812 ret = netif_set_real_num_tx_queues(net, nvdev->num_chn);
813 if (ret) {
814 if (recovering) {
815 netdev_err(net, "could not set tx queue count (ret %d)\n", ret);
816 return ret;
817 }
818 goto recover;
819 }
820
821 ret = netif_set_real_num_rx_queues(net, nvdev->num_chn);
822 if (ret) {
823 if (recovering) {
824 netdev_err(net, "could not set rx queue count (ret %d)\n", ret);
825 return ret;
826 }
827 goto recover;
828 }
829
830 out:
831 netvsc_open(net);
832 net_device_ctx->start_remove = false;
833 /* We may have missed link change notifications */
834 schedule_delayed_work(&net_device_ctx->dwork, 0);
835
836 return ret;
837
838 recover:
839 /* If the above failed, we attempt to recover through the same
840 * process but with the original number of channels.
841 */
842 netdev_err(net, "could not set channels, recovering\n");
843 recovering = true;
844 channels->combined_count = num_chn;
845 goto do_set;
846 }
847
848 static bool netvsc_validate_ethtool_ss_cmd(const struct ethtool_cmd *cmd)
849 {
850 struct ethtool_cmd diff1 = *cmd;
851 struct ethtool_cmd diff2 = {};
852
853 ethtool_cmd_speed_set(&diff1, 0);
854 diff1.duplex = 0;
855 /* advertising and cmd are usually set */
856 diff1.advertising = 0;
857 diff1.cmd = 0;
858 /* We set port to PORT_OTHER */
859 diff2.port = PORT_OTHER;
860
861 return !memcmp(&diff1, &diff2, sizeof(diff1));
862 }
863
864 static void netvsc_init_settings(struct net_device *dev)
865 {
866 struct net_device_context *ndc = netdev_priv(dev);
867
868 ndc->speed = SPEED_UNKNOWN;
869 ndc->duplex = DUPLEX_UNKNOWN;
870 }
871
872 static int netvsc_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
873 {
874 struct net_device_context *ndc = netdev_priv(dev);
875
876 ethtool_cmd_speed_set(cmd, ndc->speed);
877 cmd->duplex = ndc->duplex;
878 cmd->port = PORT_OTHER;
879
880 return 0;
881 }
882
883 static int netvsc_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
884 {
885 struct net_device_context *ndc = netdev_priv(dev);
886 u32 speed;
887
888 speed = ethtool_cmd_speed(cmd);
889 if (!ethtool_validate_speed(speed) ||
890 !ethtool_validate_duplex(cmd->duplex) ||
891 !netvsc_validate_ethtool_ss_cmd(cmd))
892 return -EINVAL;
893
894 ndc->speed = speed;
895 ndc->duplex = cmd->duplex;
896
897 return 0;
898 }
899
900 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
901 {
902 struct net_device_context *ndevctx = netdev_priv(ndev);
903 struct netvsc_device *nvdev = ndevctx->nvdev;
904 struct hv_device *hdev = ndevctx->device_ctx;
905 struct netvsc_device_info device_info;
906 int limit = ETH_DATA_LEN;
907 u32 num_chn;
908 int ret = 0;
909
910 if (ndevctx->start_remove || !nvdev || nvdev->destroy)
911 return -ENODEV;
912
913 if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
914 limit = NETVSC_MTU - ETH_HLEN;
915
916 if (mtu < NETVSC_MTU_MIN || mtu > limit)
917 return -EINVAL;
918
919 ret = netvsc_close(ndev);
920 if (ret)
921 goto out;
922
923 num_chn = nvdev->num_chn;
924
925 ndevctx->start_remove = true;
926 rndis_filter_device_remove(hdev);
927
928 ndev->mtu = mtu;
929
930 memset(&device_info, 0, sizeof(device_info));
931 device_info.ring_size = ring_size;
932 device_info.num_chn = num_chn;
933 device_info.max_num_vrss_chns = max_num_vrss_chns;
934 rndis_filter_device_add(hdev, &device_info);
935
936 out:
937 netvsc_open(ndev);
938 ndevctx->start_remove = false;
939
940 /* We may have missed link change notifications */
941 schedule_delayed_work(&ndevctx->dwork, 0);
942
943 return ret;
944 }
945
946 static struct rtnl_link_stats64 *netvsc_get_stats64(struct net_device *net,
947 struct rtnl_link_stats64 *t)
948 {
949 struct net_device_context *ndev_ctx = netdev_priv(net);
950 int cpu;
951
952 for_each_possible_cpu(cpu) {
953 struct netvsc_stats *tx_stats = per_cpu_ptr(ndev_ctx->tx_stats,
954 cpu);
955 struct netvsc_stats *rx_stats = per_cpu_ptr(ndev_ctx->rx_stats,
956 cpu);
957 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
958 unsigned int start;
959
960 do {
961 start = u64_stats_fetch_begin_irq(&tx_stats->syncp);
962 tx_packets = tx_stats->packets;
963 tx_bytes = tx_stats->bytes;
964 } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start));
965
966 do {
967 start = u64_stats_fetch_begin_irq(&rx_stats->syncp);
968 rx_packets = rx_stats->packets;
969 rx_bytes = rx_stats->bytes;
970 } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start));
971
972 t->tx_bytes += tx_bytes;
973 t->tx_packets += tx_packets;
974 t->rx_bytes += rx_bytes;
975 t->rx_packets += rx_packets;
976 }
977
978 t->tx_dropped = net->stats.tx_dropped;
979 t->tx_errors = net->stats.tx_dropped;
980
981 t->rx_dropped = net->stats.rx_dropped;
982 t->rx_errors = net->stats.rx_errors;
983
984 return t;
985 }
986
987 static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
988 {
989 struct net_device_context *ndevctx = netdev_priv(ndev);
990 struct hv_device *hdev = ndevctx->device_ctx;
991 struct sockaddr *addr = p;
992 char save_adr[ETH_ALEN];
993 unsigned char save_aatype;
994 int err;
995
996 memcpy(save_adr, ndev->dev_addr, ETH_ALEN);
997 save_aatype = ndev->addr_assign_type;
998
999 err = eth_mac_addr(ndev, p);
1000 if (err != 0)
1001 return err;
1002
1003 err = rndis_filter_set_device_mac(hdev, addr->sa_data);
1004 if (err != 0) {
1005 /* roll back to saved MAC */
1006 memcpy(ndev->dev_addr, save_adr, ETH_ALEN);
1007 ndev->addr_assign_type = save_aatype;
1008 }
1009
1010 return err;
1011 }
1012
1013 #ifdef CONFIG_NET_POLL_CONTROLLER
1014 static void netvsc_poll_controller(struct net_device *net)
1015 {
1016 /* As netvsc_start_xmit() works synchronous we don't have to
1017 * trigger anything here.
1018 */
1019 }
1020 #endif
1021
1022 static const struct ethtool_ops ethtool_ops = {
1023 .get_drvinfo = netvsc_get_drvinfo,
1024 .get_link = ethtool_op_get_link,
1025 .get_channels = netvsc_get_channels,
1026 .set_channels = netvsc_set_channels,
1027 .get_ts_info = ethtool_op_get_ts_info,
1028 .get_settings = netvsc_get_settings,
1029 .set_settings = netvsc_set_settings,
1030 };
1031
1032 static const struct net_device_ops device_ops = {
1033 .ndo_open = netvsc_open,
1034 .ndo_stop = netvsc_close,
1035 .ndo_start_xmit = netvsc_start_xmit,
1036 .ndo_set_rx_mode = netvsc_set_multicast_list,
1037 .ndo_change_mtu = netvsc_change_mtu,
1038 .ndo_validate_addr = eth_validate_addr,
1039 .ndo_set_mac_address = netvsc_set_mac_addr,
1040 .ndo_select_queue = netvsc_select_queue,
1041 .ndo_get_stats64 = netvsc_get_stats64,
1042 #ifdef CONFIG_NET_POLL_CONTROLLER
1043 .ndo_poll_controller = netvsc_poll_controller,
1044 #endif
1045 };
1046
1047 /*
1048 * Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link
1049 * down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is
1050 * present send GARP packet to network peers with netif_notify_peers().
1051 */
1052 static void netvsc_link_change(struct work_struct *w)
1053 {
1054 struct net_device_context *ndev_ctx =
1055 container_of(w, struct net_device_context, dwork.work);
1056 struct hv_device *device_obj = ndev_ctx->device_ctx;
1057 struct net_device *net = hv_get_drvdata(device_obj);
1058 struct netvsc_device *net_device;
1059 struct rndis_device *rdev;
1060 struct netvsc_reconfig *event = NULL;
1061 bool notify = false, reschedule = false;
1062 unsigned long flags, next_reconfig, delay;
1063
1064 rtnl_lock();
1065 if (ndev_ctx->start_remove)
1066 goto out_unlock;
1067
1068 net_device = ndev_ctx->nvdev;
1069 rdev = net_device->extension;
1070
1071 next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;
1072 if (time_is_after_jiffies(next_reconfig)) {
1073 /* link_watch only sends one notification with current state
1074 * per second, avoid doing reconfig more frequently. Handle
1075 * wrap around.
1076 */
1077 delay = next_reconfig - jiffies;
1078 delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;
1079 schedule_delayed_work(&ndev_ctx->dwork, delay);
1080 goto out_unlock;
1081 }
1082 ndev_ctx->last_reconfig = jiffies;
1083
1084 spin_lock_irqsave(&ndev_ctx->lock, flags);
1085 if (!list_empty(&ndev_ctx->reconfig_events)) {
1086 event = list_first_entry(&ndev_ctx->reconfig_events,
1087 struct netvsc_reconfig, list);
1088 list_del(&event->list);
1089 reschedule = !list_empty(&ndev_ctx->reconfig_events);
1090 }
1091 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1092
1093 if (!event)
1094 goto out_unlock;
1095
1096 switch (event->event) {
1097 /* Only the following events are possible due to the check in
1098 * netvsc_linkstatus_callback()
1099 */
1100 case RNDIS_STATUS_MEDIA_CONNECT:
1101 if (rdev->link_state) {
1102 rdev->link_state = false;
1103 netif_carrier_on(net);
1104 netif_tx_wake_all_queues(net);
1105 } else {
1106 notify = true;
1107 }
1108 kfree(event);
1109 break;
1110 case RNDIS_STATUS_MEDIA_DISCONNECT:
1111 if (!rdev->link_state) {
1112 rdev->link_state = true;
1113 netif_carrier_off(net);
1114 netif_tx_stop_all_queues(net);
1115 }
1116 kfree(event);
1117 break;
1118 case RNDIS_STATUS_NETWORK_CHANGE:
1119 /* Only makes sense if carrier is present */
1120 if (!rdev->link_state) {
1121 rdev->link_state = true;
1122 netif_carrier_off(net);
1123 netif_tx_stop_all_queues(net);
1124 event->event = RNDIS_STATUS_MEDIA_CONNECT;
1125 spin_lock_irqsave(&ndev_ctx->lock, flags);
1126 list_add(&event->list, &ndev_ctx->reconfig_events);
1127 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1128 reschedule = true;
1129 }
1130 break;
1131 }
1132
1133 rtnl_unlock();
1134
1135 if (notify)
1136 netdev_notify_peers(net);
1137
1138 /* link_watch only sends one notification with current state per
1139 * second, handle next reconfig event in 2 seconds.
1140 */
1141 if (reschedule)
1142 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1143
1144 return;
1145
1146 out_unlock:
1147 rtnl_unlock();
1148 }
1149
1150 static void netvsc_free_netdev(struct net_device *netdev)
1151 {
1152 struct net_device_context *net_device_ctx = netdev_priv(netdev);
1153
1154 free_percpu(net_device_ctx->tx_stats);
1155 free_percpu(net_device_ctx->rx_stats);
1156 free_netdev(netdev);
1157 }
1158
1159 static void netvsc_notify_peers(struct work_struct *wrk)
1160 {
1161 struct garp_wrk *gwrk;
1162
1163 gwrk = container_of(wrk, struct garp_wrk, dwrk);
1164
1165 netdev_notify_peers(gwrk->netdev);
1166
1167 atomic_dec(&gwrk->netvsc_dev->vf_use_cnt);
1168 }
1169
1170 static struct net_device *get_netvsc_net_device(char *mac)
1171 {
1172 struct net_device *dev, *found = NULL;
1173 int rtnl_locked;
1174
1175 rtnl_locked = rtnl_trylock();
1176
1177 for_each_netdev(&init_net, dev) {
1178 if (memcmp(dev->dev_addr, mac, ETH_ALEN) == 0) {
1179 if (dev->netdev_ops != &device_ops)
1180 continue;
1181 found = dev;
1182 break;
1183 }
1184 }
1185 if (rtnl_locked)
1186 rtnl_unlock();
1187
1188 return found;
1189 }
1190
1191 static int netvsc_register_vf(struct net_device *vf_netdev)
1192 {
1193 struct net_device *ndev;
1194 struct net_device_context *net_device_ctx;
1195 struct netvsc_device *netvsc_dev;
1196 const struct ethtool_ops *eth_ops = vf_netdev->ethtool_ops;
1197
1198 if (eth_ops == NULL || eth_ops == &ethtool_ops)
1199 return NOTIFY_DONE;
1200
1201 /*
1202 * We will use the MAC address to locate the synthetic interface to
1203 * associate with the VF interface. If we don't find a matching
1204 * synthetic interface, move on.
1205 */
1206 ndev = get_netvsc_net_device(vf_netdev->dev_addr);
1207 if (!ndev)
1208 return NOTIFY_DONE;
1209
1210 net_device_ctx = netdev_priv(ndev);
1211 netvsc_dev = net_device_ctx->nvdev;
1212 if (netvsc_dev == NULL)
1213 return NOTIFY_DONE;
1214
1215 netdev_info(ndev, "VF registering: %s\n", vf_netdev->name);
1216 /*
1217 * Take a reference on the module.
1218 */
1219 try_module_get(THIS_MODULE);
1220 netvsc_dev->vf_netdev = vf_netdev;
1221 return NOTIFY_OK;
1222 }
1223
1224
1225 static int netvsc_vf_up(struct net_device *vf_netdev)
1226 {
1227 struct net_device *ndev;
1228 struct netvsc_device *netvsc_dev;
1229 const struct ethtool_ops *eth_ops = vf_netdev->ethtool_ops;
1230 struct net_device_context *net_device_ctx;
1231
1232 if (eth_ops == &ethtool_ops)
1233 return NOTIFY_DONE;
1234
1235 ndev = get_netvsc_net_device(vf_netdev->dev_addr);
1236 if (!ndev)
1237 return NOTIFY_DONE;
1238
1239 net_device_ctx = netdev_priv(ndev);
1240 netvsc_dev = net_device_ctx->nvdev;
1241
1242 if ((netvsc_dev == NULL) || (netvsc_dev->vf_netdev == NULL))
1243 return NOTIFY_DONE;
1244
1245 netdev_info(ndev, "VF up: %s\n", vf_netdev->name);
1246 netvsc_dev->vf_inject = true;
1247
1248 /*
1249 * Open the device before switching data path.
1250 */
1251 rndis_filter_open(net_device_ctx->device_ctx);
1252
1253 /*
1254 * notify the host to switch the data path.
1255 */
1256 netvsc_switch_datapath(ndev, true);
1257 netdev_info(ndev, "Data path switched to VF: %s\n", vf_netdev->name);
1258
1259 netif_carrier_off(ndev);
1260
1261 /*
1262 * Now notify peers. We are scheduling work to
1263 * notify peers; take a reference to prevent
1264 * the VF interface from vanishing.
1265 */
1266 atomic_inc(&netvsc_dev->vf_use_cnt);
1267 net_device_ctx->gwrk.netdev = vf_netdev;
1268 net_device_ctx->gwrk.netvsc_dev = netvsc_dev;
1269 schedule_work(&net_device_ctx->gwrk.dwrk);
1270
1271 return NOTIFY_OK;
1272 }
1273
1274
1275 static int netvsc_vf_down(struct net_device *vf_netdev)
1276 {
1277 struct net_device *ndev;
1278 struct netvsc_device *netvsc_dev;
1279 struct net_device_context *net_device_ctx;
1280 const struct ethtool_ops *eth_ops = vf_netdev->ethtool_ops;
1281
1282 if (eth_ops == &ethtool_ops)
1283 return NOTIFY_DONE;
1284
1285 ndev = get_netvsc_net_device(vf_netdev->dev_addr);
1286 if (!ndev)
1287 return NOTIFY_DONE;
1288
1289 net_device_ctx = netdev_priv(ndev);
1290 netvsc_dev = net_device_ctx->nvdev;
1291
1292 if ((netvsc_dev == NULL) || (netvsc_dev->vf_netdev == NULL))
1293 return NOTIFY_DONE;
1294
1295 netdev_info(ndev, "VF down: %s\n", vf_netdev->name);
1296 netvsc_dev->vf_inject = false;
1297 /*
1298 * Wait for currently active users to
1299 * drain out.
1300 */
1301
1302 while (atomic_read(&netvsc_dev->vf_use_cnt) != 0)
1303 udelay(50);
1304 netvsc_switch_datapath(ndev, false);
1305 netdev_info(ndev, "Data path switched from VF: %s\n", vf_netdev->name);
1306 rndis_filter_close(net_device_ctx->device_ctx);
1307 netif_carrier_on(ndev);
1308 /*
1309 * Notify peers.
1310 */
1311 atomic_inc(&netvsc_dev->vf_use_cnt);
1312 net_device_ctx->gwrk.netdev = ndev;
1313 net_device_ctx->gwrk.netvsc_dev = netvsc_dev;
1314 schedule_work(&net_device_ctx->gwrk.dwrk);
1315
1316 return NOTIFY_OK;
1317 }
1318
1319
1320 static int netvsc_unregister_vf(struct net_device *vf_netdev)
1321 {
1322 struct net_device *ndev;
1323 struct netvsc_device *netvsc_dev;
1324 const struct ethtool_ops *eth_ops = vf_netdev->ethtool_ops;
1325 struct net_device_context *net_device_ctx;
1326
1327 if (eth_ops == &ethtool_ops)
1328 return NOTIFY_DONE;
1329
1330 ndev = get_netvsc_net_device(vf_netdev->dev_addr);
1331 if (!ndev)
1332 return NOTIFY_DONE;
1333
1334 net_device_ctx = netdev_priv(ndev);
1335 netvsc_dev = net_device_ctx->nvdev;
1336 if (netvsc_dev == NULL)
1337 return NOTIFY_DONE;
1338 netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
1339
1340 netvsc_dev->vf_netdev = NULL;
1341 module_put(THIS_MODULE);
1342 return NOTIFY_OK;
1343 }
1344
1345 static int netvsc_probe(struct hv_device *dev,
1346 const struct hv_vmbus_device_id *dev_id)
1347 {
1348 struct net_device *net = NULL;
1349 struct net_device_context *net_device_ctx;
1350 struct netvsc_device_info device_info;
1351 struct netvsc_device *nvdev;
1352 int ret;
1353
1354 net = alloc_etherdev_mq(sizeof(struct net_device_context),
1355 num_online_cpus());
1356 if (!net)
1357 return -ENOMEM;
1358
1359 netif_carrier_off(net);
1360
1361 net_device_ctx = netdev_priv(net);
1362 net_device_ctx->device_ctx = dev;
1363 net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);
1364 if (netif_msg_probe(net_device_ctx))
1365 netdev_dbg(net, "netvsc msg_enable: %d\n",
1366 net_device_ctx->msg_enable);
1367
1368 net_device_ctx->tx_stats = netdev_alloc_pcpu_stats(struct netvsc_stats);
1369 if (!net_device_ctx->tx_stats) {
1370 free_netdev(net);
1371 return -ENOMEM;
1372 }
1373 net_device_ctx->rx_stats = netdev_alloc_pcpu_stats(struct netvsc_stats);
1374 if (!net_device_ctx->rx_stats) {
1375 free_percpu(net_device_ctx->tx_stats);
1376 free_netdev(net);
1377 return -ENOMEM;
1378 }
1379
1380 hv_set_drvdata(dev, net);
1381
1382 net_device_ctx->start_remove = false;
1383
1384 INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
1385 INIT_WORK(&net_device_ctx->work, do_set_multicast);
1386 INIT_WORK(&net_device_ctx->gwrk.dwrk, netvsc_notify_peers);
1387
1388 spin_lock_init(&net_device_ctx->lock);
1389 INIT_LIST_HEAD(&net_device_ctx->reconfig_events);
1390
1391 net->netdev_ops = &device_ops;
1392
1393 net->hw_features = NETVSC_HW_FEATURES;
1394 net->features = NETVSC_HW_FEATURES | NETIF_F_HW_VLAN_CTAG_TX;
1395
1396 net->ethtool_ops = &ethtool_ops;
1397 SET_NETDEV_DEV(net, &dev->device);
1398
1399 /* We always need headroom for rndis header */
1400 net->needed_headroom = RNDIS_AND_PPI_SIZE;
1401
1402 /* Notify the netvsc driver of the new device */
1403 memset(&device_info, 0, sizeof(device_info));
1404 device_info.ring_size = ring_size;
1405 device_info.max_num_vrss_chns = max_num_vrss_chns;
1406 ret = rndis_filter_device_add(dev, &device_info);
1407 if (ret != 0) {
1408 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
1409 netvsc_free_netdev(net);
1410 hv_set_drvdata(dev, NULL);
1411 return ret;
1412 }
1413 memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
1414
1415 nvdev = net_device_ctx->nvdev;
1416 netif_set_real_num_tx_queues(net, nvdev->num_chn);
1417 netif_set_real_num_rx_queues(net, nvdev->num_chn);
1418
1419 netvsc_init_settings(net);
1420
1421 ret = register_netdev(net);
1422 if (ret != 0) {
1423 pr_err("Unable to register netdev.\n");
1424 rndis_filter_device_remove(dev);
1425 netvsc_free_netdev(net);
1426 }
1427
1428 return ret;
1429 }
1430
1431 static int netvsc_remove(struct hv_device *dev)
1432 {
1433 struct net_device *net;
1434 struct net_device_context *ndev_ctx;
1435 struct netvsc_device *net_device;
1436
1437 net = hv_get_drvdata(dev);
1438
1439 if (net == NULL) {
1440 dev_err(&dev->device, "No net device to remove\n");
1441 return 0;
1442 }
1443
1444
1445 ndev_ctx = netdev_priv(net);
1446 net_device = ndev_ctx->nvdev;
1447
1448 /* Avoid racing with netvsc_change_mtu()/netvsc_set_channels()
1449 * removing the device.
1450 */
1451 rtnl_lock();
1452 ndev_ctx->start_remove = true;
1453 rtnl_unlock();
1454
1455 cancel_delayed_work_sync(&ndev_ctx->dwork);
1456 cancel_work_sync(&ndev_ctx->work);
1457
1458 /* Stop outbound asap */
1459 netif_tx_disable(net);
1460
1461 unregister_netdev(net);
1462
1463 /*
1464 * Call to the vsc driver to let it know that the device is being
1465 * removed
1466 */
1467 rndis_filter_device_remove(dev);
1468
1469 hv_set_drvdata(dev, NULL);
1470
1471 netvsc_free_netdev(net);
1472 return 0;
1473 }
1474
1475 static const struct hv_vmbus_device_id id_table[] = {
1476 /* Network guid */
1477 { HV_NIC_GUID, },
1478 { },
1479 };
1480
1481 MODULE_DEVICE_TABLE(vmbus, id_table);
1482
1483 /* The one and only one */
1484 static struct hv_driver netvsc_drv = {
1485 .name = KBUILD_MODNAME,
1486 .id_table = id_table,
1487 .probe = netvsc_probe,
1488 .remove = netvsc_remove,
1489 };
1490
1491
1492 /*
1493 * On Hyper-V, every VF interface is matched with a corresponding
1494 * synthetic interface. The synthetic interface is presented first
1495 * to the guest. When the corresponding VF instance is registered,
1496 * we will take care of switching the data path.
1497 */
1498 static int netvsc_netdev_event(struct notifier_block *this,
1499 unsigned long event, void *ptr)
1500 {
1501 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
1502
1503 switch (event) {
1504 case NETDEV_REGISTER:
1505 return netvsc_register_vf(event_dev);
1506 case NETDEV_UNREGISTER:
1507 return netvsc_unregister_vf(event_dev);
1508 case NETDEV_UP:
1509 return netvsc_vf_up(event_dev);
1510 case NETDEV_DOWN:
1511 return netvsc_vf_down(event_dev);
1512 default:
1513 return NOTIFY_DONE;
1514 }
1515 }
1516
1517 static struct notifier_block netvsc_netdev_notifier = {
1518 .notifier_call = netvsc_netdev_event,
1519 };
1520
1521 static void __exit netvsc_drv_exit(void)
1522 {
1523 unregister_netdevice_notifier(&netvsc_netdev_notifier);
1524 vmbus_driver_unregister(&netvsc_drv);
1525 }
1526
1527 static int __init netvsc_drv_init(void)
1528 {
1529 int ret;
1530
1531 if (ring_size < RING_SIZE_MIN) {
1532 ring_size = RING_SIZE_MIN;
1533 pr_info("Increased ring_size to %d (min allowed)\n",
1534 ring_size);
1535 }
1536 ret = vmbus_driver_register(&netvsc_drv);
1537
1538 if (ret)
1539 return ret;
1540
1541 register_netdevice_notifier(&netvsc_netdev_notifier);
1542 return 0;
1543 }
1544
1545 MODULE_LICENSE("GPL");
1546 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
1547
1548 module_init(netvsc_drv_init);
1549 module_exit(netvsc_drv_exit);
Linux kernel - Deliverables
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